So the biggest thing about Borderlands is of course, the Vaults. Not only the vaults, but the monsters inside of them. So this post, I'm gonna rank the vault monsters from easiest to fight, to hardest to fight. I'm going to be gaging the difficulties based on the first playthrough, as depending on the game and the mode your playing, all of them can prove challenging. Now as always, this is purely my opinion. Some monsters I may say are hard, may be easy to others, or vice versa. So let's not waste any time and get right into it. This will include all vault monsters in Borderlands 3, not just the final battle. However I will be excluding vault monsters from Tales games, as those are fought both with QTEs.
So let's start with the easiest one, which is the Graveward from Borderlands 3. The flora themed vault monster living inside the vault on Eden-6. I rank this one the easiest because it's attacks are all extremely avoidable, and if you move around correctly, you can go the entire fight without getting hit even once. The only things you really have to worry about are the grogs that spawn in. The fun thing about the Graveward, is that he's slow, and all his attacks come with beacons, or lit up danger zones. Stay out the zones, and you're set. The trickiest part of the fight is when he lifts the platform, and sends you sliding down. Simply slide into the hole on the right of the platform, wait for the green acid orbs to pass you by, and that's that. Throughout the fight, just aim for the Gravwards weak spot with a rapid firing weapon to quickly whittle down health until he's defeated. Even in higher mayhem difficulties, the Graveward poses very little threat, and is a pushover of a vault monster.
Now when I first started playing Borderlands back when the first game came out, I was a mere child and couldn't even make it far enough in the game to fight the Destroyer. When I finally did as a teenager, I would've said it was the hardest fight I've ever seen. Now as an adult, with a better understand of game mechanics (and better aim), the Destroyer is fairly easy on both playthroughs. Simply because you can essentially cheese the entire fight. On the map, there's two pillars. Simply hide behind the pillar and shoot the Destroyer until it's dead. You will have to worry about the flying rakks constantly spawning in, but luckily, they have extremely low health, and should thr Destroyer get a good hit on you, those rakks are a quick second wind.
Now the Destroyer is a bullet sponge, so the fight will take time if you dont have high power weapons, and you will have to get in close if you're a shotgun fanatic. Otherwise, simply hide throughout all his attacks, and the fight is as good as won.
Look out, the lava is rising! Liliths constant worry of the lava is arguably the most annoying thing about this fight. By the time you reach the Warrior, you're about level 36, have got a decent arsenal under your belt, and a raging hot need to avenge Bloodwing. The Warriors fight can be tricky, as in order to actually deal decent damage, you need to break the rock on its chest blocking it's soft inner molten core. Thing is, right after you break it, the Warrior retreats back into the lava, causing it to rise, as of Lilith didn't make that obvious enough.
The other thing you have to worry about it the Warriors tail slam, which if you don't jump to dodge it, deals decent damage, and sends you flying into the air. Another thing to look out for is the never ending crystalisks that spawn, and the occasionaly rakk that'll spot you.
Overall, the Warriors fight isn't so much difficult, as it is tedious. Eventually, you'll beat it down enough and crush it's head with the moonshot canon, much to Jack's dismay.
Oh the Rampager. My first encounter with you was a devastating one. Not because of your never ending fire waves, or the Eridians constantly up my ass, but because you're just too damn agile for a creature of your size.
The Rampager fight was tough the first time I fought it. He comes in three waves, all with different attacks and abilities that can quickly eat away at your shields and health, and while Maya is there.. she isn't much help. With the ever spawning Eridians constantly knocking you around, and the constant projectiles, the Rampager is a tough one. Especially come the third phase, where even standing still for a second could lead to an instant down.
The Rampager is tough, and agile, and good if you're looking for a quick death on your first playthrough. Kind of makes the Graveward that much more disappointing when the first vault monster you get to kill puts up such a good fight.
Now, is Tyreen a vault monster? No. However, given as how she fuses with the monster of the Great Vault, she technically counts as one.
Now Tyreens fight is tricky. Not only can she leave the arena, most of her attacks prevent her from taking any damage at all. Her attacks are wide, and extremely powerful, not to mention the various creatures that spawn in and hassle you the entire fight. Tyreens attacks can be pretty easy to avoid, but the fact that she makes damaging her such a struggle is the reason she's so high on the list.
Her fight is annoying, and all around a pain to complete your first time fighting her. Once you get it down, much like with any of these monsters, it can quickly become a cake wake, but for have never fought her before? Royal pain, much like the god queen herself.
I say this with the most emotion and sentiment I can portray over text: Screw. This. Fight.
Even today, as I'm writing this, the Sentinel has proven to be such a difficult fight, that any time I manage to defeat it on the first try, I consider myself a master of the trade. From the fact that this thing has 7 whole phases, to the fact that there's Eridians swarming the arena on top of him, it's just an all around nightmare.
The first version of the Sentinel has 4 phases. The first three require you to break down his shield, while avoiding his fast and devastating attacks. When his shield goes down, he becomes immune to all damage, and releases a nova, which if you don't avoid it, is capable of insta-downing you. Each phases comes with a different element that he becomes immune to, until the fourth phase, where you can finally hit his health. Defeat the fourth phase, and you think all is well, right? Wrong.
Once the Sentinel is defeated, he turns into a giant version of himself, called the Empyrean Sentinel. This version can make the entire floor untouchable with electricity, has full AOE attacks, and can only be damaged by hitting its face, so should you end up behind it trying to avoid attacks and swarms of Eridians, you gotta find your way back around. This version goes through 3 phases, all with different elements as well. This fight is just.. agonizing, no matter how well equipped you are. It's long, it's tedious, and if you die? Back to square one.. and to make it worse, the game made him a raid boss post story completion. Meaning you have to pay your hard earned moonstones just to torture yourself for a chance at better loot. Let me tell you, it's not worth it. There's better ways to get the legendary you're looking for, I promise. It's called the Grinder. I'd rather waste away at the Grinder than fight this bastard over and over in a Borderlands game that arguably has the WORST legendary drop chances. My sanity is better drained elsewhere. Like collecting 150 claptrap components for Tannis.
So, there you have it. My list of easiest to hardest to fight vault monsters on the first playthrough. Playthrough 2, TVHM/UVHM, Mayhem Mode, that all changes the game. Makes things difficult all around, but still doable if you build yourself right and bring the right gear. Let me know if you agree with my list, or if you disagree, I'd love to hear some feedback. Let me know your experiences with these badass monsters.. and if you know a way to cheese the Sentinel, maybe throw that my way too. I'm tired of him.